JPH02271177A - Water and hot water mixing device - Google Patents

Abstract

PURPOSE:To ensure compact and low cost design by providing a valve spindle for opposing forces due to the outlet pressure of valve bodies at hot water supply and cold water supply sides for controlling a flowrate, a variable operation force generation means for applying an energizing force to the valve spindle and a linear type resistor for generating an approximate proportional relation between a flowrate and a pressure difference between the valve body and mixing part. CONSTITUTION:When forward current is supplied to a coil 21 in a control circuit 18, the core 20 of a variable operation force generation means 19 energizes a valve spindle 8 downward and closes a cold water supply side, while opening a hot water supply side. As a result, the outlet pressure PH2 and PC2 of a hot water supply valve body 4 and a cold water supply valve body 6 changes, and an automatic relief valve 5 keeps a pressure balance, thereby increasing the temperature of a mixture of hot and cold water. When reverse current is supplied to the coil 21, the aforesaid temperature drops. The temperature of the mixture is detected with a thermistor 15 and calculated with the control circuit 18, thereby controling current supply to the coil 21. The automatic relief valve 5 generates a pressure adjustment error, depending upon the dimensional errors of valve bodies 4 and 6, and a piston 9, and the performance of the variable operation force generation means 19. IN order to minimize the fluctuation of hot water temperature due to the aforesaid error, linear type resistors 26 and 27 are provided. According to the aforesaid construction, compact design can be ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hot water mixing device that adjusts the mixing ratio of hot water and water to obtain an optimal mixed water temperature.

2. Description of the Related Art Conventionally, there has been a hot water mixing device of this type as shown in FIG.

In FIG. 4, 1 is a hot water flow path, 2 is a water flow path, and an automatic pressure regulating valve 3 is provided in association with each flow path. The automatic pressure regulating valve 3 includes a hot water side valve body 4 that reduces the primary pressure PH1 of the hot water flow path 1, a hot water side valve seat 5, a water side valve body 6 that reduces the primary pressure PCI of the water flow path 2, and a water side valve body 6 that reduces the primary pressure PCI of the water flow path 2. The side valve seat 7, the valve shaft 8 connecting the hot water side valve body 4 and the water side valve body 6, and the primary pressure P11 after depressurization of the hot water and water.
1. It is composed of a piston 9 that operates based on the PCI pressure difference, and even if the pressure of hot water or water suddenly changes, the automatic pressure regulating valve 3 moves with that pressure, and the secondary pressures P H2 and PC2 of hot water and water are It works so that it always remains equal.

The hot water side valve body 4 and the water side valve body 6 each have a plurality of blades 4a and 6a as rotational force generating means, and the blades rotate the automatic pressure regulating valve 3 by the water flow to prevent the adhesion of dust and scale. The mixing ratio of hot water and water is determined by motor 1 with gear lO.
iJ! energized by 1! The mixing temperature is varied by moving the 218 valve 12 left and right. Reference numeral 13 denotes a mixing section for hot water and water. After mixing, the hot water is discharged via a flow rate regulating on-off valve 14, the temperature of which is detected by a thermistor 15, the flow rate by an IT sensor I6, and a setting device 17.
The controller 18 energizes the motor 11 and the flow control valve 14 to match the value of .

Problems to be Solved by the Invention However, in the above configuration, the automatic pressure regulating valve 3 and i
[Since the valve 12 is independent, it becomes large.

The present invention is intended to solve such conventional problems, and its purpose is to obtain a small-sized mixing device that combines the functions of a pressure regulating valve and a temperature regulating valve.

Means for Solving the Problems In order to achieve the above object, the hot water mixing device of the present invention has the following features:
A hot water flow path and a water flow path, a hot water side valve body and a water side valve body that adjust the flow rates of the hot water flow path and the water flow path, a mixing part of the hot water flow path and the water flow path, and a hot water side valve body and a water side valve body. The relationship between the flow rate and the pressure difference between the valve shaft that makes the force due to the outlet pressure of the valve shaft oppose each other, the variable operating force generating means that applies a biasing force to the valve shaft, the hot water side valve body, the water side valve body, and the mixing section. is approximately directly proportional to the linear resistance.

Operation With the above configuration, the mixing ratio is adjusted by the variable operating force generating means while balancing the outlet pressures of the hot water side valve body and the water side valve body.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. Note that FIG. 1 is a sectional view of the hot water mixing device, and the same parts as in FIG. 4 are given the same numbers.

There is a variable operating force generating means 19 on the water flow path 2 side, the variable operating force generating means 19 has an iron core 20 and a waterproof and insulated coil 21 around the iron core 20, and the coil 21 is connected to the control circuit 18. ing. A magnetic body 22 is attached to a holder 23 on the water flow path side of the automatic pressure regulating valve 3. A spring 25 is provided between the holder 23 and the plug 24, and urges the automatic pressure regulating valve 3 downward. When the coil 21 is energized, the iron core 20 becomes an electromagnet and the magnetic body 22 moves by attraction or repulsion.

The hot water and water that have passed through the hot water side valve body 4 and the water side valve body 6 pass through the hot water side linear resistance 26 and the water side linear resistance 27 and are mixed in the mixing path 13. Linear resistance is such that the relationship between the passing flow rate and the pressure difference is almost directly proportional as shown in characteristic A in Figure 2. This linear resistance is constructed, for example, by providing a large number of narrow grid-like passages 26a, 26b as shown in FIG. 28 is a plug for sealing off water.

Next, the present invention will be explained in detail. When a positive current is applied to the coil 21 from the control circuit 18, the iron core 20 generates an electromagnetic force, which repels the magnetic body 22 and urges the valve shaft 8 downward. As a result, the water side is closed and the hot water side is opened, and the outlet pressures PH2 and PC2 of the hot water side valve body 4 and the water side valve body 6 change, respectively, and the automatic pressure regulating valve 3 is balanced.

As a result, the temperature of the mixed water increases. When a negative current is applied to the coil 21, the iron core 20 attracts the magnetic body 22, and moves the valve shaft 8 upward against the force of the spring 25, opening the water side and closing the hot water side. As a result, the mixed water temperature becomes lower.

By changing the current flowing through the coil 21 in this way, the balance point of the automatic pressure regulating valve 3 can be moved. The mixed water temperature is detected by the thermistor 15 and the control circuit 18
is calculated to control the current to the coil 21.

When the water pressure fluctuates, the automatic pressure regulating valve 3 operates as before, and if the pressure receiving areas of the hot water side valve body 4, the water side valve body 6, and the piston 9 are made approximately equal, the secondary pressures PH2 and PC2 are variable. The state at the balance point is maintained by the operating force generating means 19, the change in the mixing ratio of hot water and water is small, and the water temperature is stable. In this ideal state, the hot water temperature does not fluctuate due to changes in pressure or flow rate, but dimensional errors in the hot water side valve body 4, water side valve body 6, and piston 9 or variable operating force generating means 19 may occur due to processing accuracy. Due to the resolution and reproducibility of the automatic pressure regulating valve 3, a pressure regulation error occurs. In order to reduce fluctuations in hot water temperature due to pressure adjustment errors, the differential pressure generated between the linear resistors 26 and 27 must be at least a certain value. If the differential pressure necessary for control in the characteristic A of FIG. 2 is Pl, the minimum amount of water that can be controlled between the hot water side and the water side is Ql. On the other hand, if the maximum flow rate required by the person using the toilet is Q2, the differential pressure will be P2. When a normal orifice is used instead of a linear resistance, as shown in characteristic B in Figure 2, if the differential pressure P1 required for control is equal to that in the case of a linear resistance, the minimum controllable water amount is Ql'', while at the maximum 2ii1jtQ2 The differential pressure is P2'.In other words, when linear resistance is used, the minimum controllable water flow is small (and the differential pressure that occurs at the maximum flow rate is small. Therefore, the pressure loss in the passage can be reduced, and the variable operating force generating means The maximum required driving force of 19 can also be reduced.

The control circuit 18 includes a dither circuit 18a and a coil 21.
A minute alternating current signal is superimposed on the drive signal. This dither signal causes the automatic pressure regulating valve 3 to vibrate slightly. This minute vibration is set to a magnitude and frequency that does not cause a change in the mixed water temperature. This dither signal prevents scale and dust from adhering.

Effects of the Invention As described above, the hot water mixing device of the present invention has a hot water flow path, a water flow path, a hot water side valve body and a water side valve body that adjust the flow rates of the hot water flow path and the water flow path, and a hot water side valve body. A valve stem that opposes the force due to the outlet pressure of the water side valve body, a variable operating force generating means that applies a biasing force to the valve stem, and a flow rate between the hot water side valve body/water side valve body and the mixing section. Since it has a linear resistance that is approximately directly proportional to the pressure difference, it can be made smaller and cheaper by combining an automatic pressure regulating valve and a temperature regulating valve, and force can be transmitted to the automatic pressure regulating valve without contact. There is no need for a seal and the reliability is high. Further, the pressure loss is small and the required driving force of the variable operating force generating means is small.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a hot water mixing device according to an embodiment of the present invention, Fig. 2 is a characteristic diagram of the same linear resistance, Fig. 3 is a configuration diagram of the same linear resistance, and Fig. 4 is a diagram of a conventional hot water mixing device. It is a configuration sectional view. 1...Hot water flow path, 2...Water flow path, 4...
...Hot water side valve body, 6...Water side valve body, 8...
...Valve shaft, 19...Variable operating force generating means, 2
6.27...Linear resistance. Name of agent: Patent attorney Shigetaka Awano

Claims (1)

[Claims] A hot water flow path and a water flow path, a hot water side valve body and a water side valve body that adjust the flow rates of the hot water flow path and the water flow path, a mixing part of the hot water flow path and the water flow path, and the hot water side valve body. and a valve shaft that makes forces due to outlet pressures of the water side valve body oppose each other, variable operating force generating means that applies a biasing force to the valve shaft, the hot water side valve body, the water side valve body, and the mixing section. A hot water mixing device with a linear resistance in which the relationship between flow rate and pressure difference is approximately directly proportional.